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kernel/linux-imx6_3.14.28/include/linux/kmsg_dump.h 2.85 KB
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  /*
   * linux/include/kmsg_dump.h
   *
   * Copyright (C) 2009 Net Insight AB
   *
   * Author: Simon Kagstrom <simon.kagstrom@netinsight.net>
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file COPYING in the main directory of this archive
   * for more details.
   */
  #ifndef _LINUX_KMSG_DUMP_H
  #define _LINUX_KMSG_DUMP_H
  
  #include <linux/errno.h>
  #include <linux/list.h>
  
  /*
   * Keep this list arranged in rough order of priority. Anything listed after
   * KMSG_DUMP_OOPS will not be logged by default unless printk.always_kmsg_dump
   * is passed to the kernel.
   */
  enum kmsg_dump_reason {
  	KMSG_DUMP_UNDEF,
  	KMSG_DUMP_PANIC,
  	KMSG_DUMP_OOPS,
  	KMSG_DUMP_EMERG,
  	KMSG_DUMP_RESTART,
  	KMSG_DUMP_HALT,
  	KMSG_DUMP_POWEROFF,
  };
  
  /**
   * struct kmsg_dumper - kernel crash message dumper structure
   * @list:	Entry in the dumper list (private)
   * @dump:	Call into dumping code which will retrieve the data with
   * 		through the record iterator
   * @max_reason:	filter for highest reason number that should be dumped
   * @registered:	Flag that specifies if this is already registered
   */
  struct kmsg_dumper {
  	struct list_head list;
  	void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
  	enum kmsg_dump_reason max_reason;
  	bool active;
  	bool registered;
  
  	/* private state of the kmsg iterator */
  	u32 cur_idx;
  	u32 next_idx;
  	u64 cur_seq;
  	u64 next_seq;
  };
  
  #ifdef CONFIG_PRINTK
  void kmsg_dump(enum kmsg_dump_reason reason);
  
  bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog,
  			       char *line, size_t size, size_t *len);
  
  bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
  			char *line, size_t size, size_t *len);
  
  bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
  			  char *buf, size_t size, size_t *len);
  
  void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper);
  
  void kmsg_dump_rewind(struct kmsg_dumper *dumper);
  
  int kmsg_dump_register(struct kmsg_dumper *dumper);
  
  int kmsg_dump_unregister(struct kmsg_dumper *dumper);
  #else
  static inline void kmsg_dump(enum kmsg_dump_reason reason)
  {
  }
  
  static inline bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper,
  					     bool syslog, const char *line,
  					     size_t size, size_t *len)
  {
  	return false;
  }
  
  static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
  				const char *line, size_t size, size_t *len)
  {
  	return false;
  }
  
  static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
  					char *buf, size_t size, size_t *len)
  {
  	return false;
  }
  
  static inline void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper)
  {
  }
  
  static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper)
  {
  }
  
  static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
  {
  	return -EINVAL;
  }
  
  static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
  {
  	return -EINVAL;
  }
  #endif
  
  #endif /* _LINUX_KMSG_DUMP_H */